Studies on the worm populations in the alimentary tract of breeding ewes.
D000018:Abomasum; D000818:Animals; D005260:Female; D007422:Intestines; D007774:Lactation; D008297:Male; D009349:Nematode Infections / Q000662:veterinary*; D011247:Pregnancy; D012621:Seasons; D012756:Sheep; D012757:Sheep Diseases